$ trans -debug -e yandex :fr hello
[ERROR] Oops! Something went wrong and I can't translate it for you :(

This is 0.9.6.12-release on Linux with gawk 4.2.1 and fribidi 1.0.5. Translation with google and bing is OK.

$ w3m -dump http://translate.yandex.net/api/v1/tr.json/translate
{"code":410,"message":"Yandex.Translate API v1 is no longer active. Please migrate to API v1.5: https://tech.yandex.com/translate/."}